THE GOOD: Beautiful building, fairly well-maintained with just a touch of deferred maintenance, which is to be expected with a property this old. Lovely setting. Very good breakfast buffet. It is the kind of place Americans dream about when they think "country Italian villa."
THE BAD: Hotel caters to a lot of bus tours, and they overwhelm the place in the early morning and late in the day when the busses arrive. The situation is made worse by the fact that noises echo through the building, so the ruckus is shared with everyone in the villa. Very intrusive. Also, I think the staff and management is so dependent on the groups, if you are a single guest with a single problem, they really don't give you much attention. I was there 4 nights and they still weren't sure who I was by the time I left.
THE UGLY: They really need a shuttle to and from Frascati. Don't come here if you don't have your own transportation, or are not willing to walk the 20 minute steep climb from Frascati. Getting a cab is very difficult. I waited 3 hours to get a cab from Frascati to the villa, and no one cared. One company even hung up on me because the guy was annoyed that I called three times over the course of three hours. If ever there was a city that needs Uber, it's Rome. Transportation in general is a nightmare there, but getting to and from the villa is the worst.